In a school there are 1000 students in the year 1999. The number of students increased by 20% in the year 2000. And it is increased by 15% in the year 2001. But it is decreased by 18% in 2002. Then what is the strength in 2002.

• In 1999 students=1000
  In 2000 students=(1000*120)/100=1200
  In 2001 students=(1200*115)100=1380
  In 2002 students=(1380*82)100=1131.6=1132 (decreased by 18%)
• 13 years agoHelpfull: Yes(32) No(2)
• strength in 2002 = 1000*1.2*1.15*0.82= 1131.6
  
  so 1132
• 13 years agoHelpfull: Yes(22) No(0)
• its easy...increasing 1000 by 20% gives 1200
  increasing 1200 by 15% gives 1380
  then decreasing 1380 by 18% gives 1132
• 13 years agoHelpfull: Yes(6) No(0)
• In 1999 students=1000
  In 2000 students=(1000*120)/100=1200
  In 2001 students=(1200*115)100=1380
  In 2002 students=(1380*82)100=1131.6=1132 (decreased by 18%)
• 13 years agoHelpfull: Yes(5) No(1)
• In 1999 students=1000
  In 2000 students=(1000*120)/100=1200
  In 2001 students=(1200*115)100=1380
  In 2002 students=(1380*82)100=1131.6=1132 (decreased by 18%)
• 13 years agoHelpfull: Yes(3) No(1)
• successive increase of 20% and 15% is given by:
  20+15+(20*15)/100,i.e 38%
  now,38% increase and 18% decrease corresponds to net increase/decrease is given by:
  38+(-18)+{38*(-18)/100} i.e, 13.16%(positive means increase).
  therefore,net strength in 2002 is given by increase of 13.16% to strength in 1999 i.e,1000 which is given by:
  113.16% of 1000 which is equal to 1131.6!!!!!
• 13 years agoHelpfull: Yes(1) No(0)
• take the first two increasing percent
  apply formula a+b+((ab)/100) (a=20 and b=15)
  therefore placing in the value of increase percent is 38%
  therefore 38% of 1000 is 38. Therefore population after 2001 is 1380
  Now population decrease by 18%, therefore 18% of 1380 is 248.4
  so final population is (1380-248.4)=1131.6 or 1132
• 13 years agoHelpfull: Yes(1) No(0)
• In 1999 students=1000
  In 2000 students=(1000*120)/100=1200
  In 2001 students=(1200*115)/100=1380
  In 2002 students=(1380*82)/100=1131.6=1132 (decreased by 18%)
  
• 10 years agoHelpfull: Yes(0) No(0)